Question: Apply double-angle formulas to verify the identity cos (2x + 7) = - 2 -sin 2x. 4. Two spotlights, one blue and the other

Apply double-angle formulas to verify the identity cos (2x + 7) = - 2 -sin 2x. 4. Two spotlights, one blue and the other

Apply double-angle formulas to verify the identity cos (2x + 7) = - 2 -sin 2x. 4. Two spotlights, one blue and the other white, are placed 6.0 m apart on a track on the ceiling of a ballroom. A stationary observer standing on the ballroom floor notices that the angle of elevation is 45 to the blue spotlight and 70 to the white one. How high, to the nearest tenth of a metre, is the ceiling of the ballroom?

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